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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd57c8536160c5ac53f94d3ea8a8772f338f2098e127fb3cd20bbcd13cec456a' 
  AND token = '0Aq+Ms6cpDbwjPHMyxPxwc70spo8difqKZ5d9PYTu4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}